A rotary damper with adjustable overload protection threshold

Abstract

This utility model discloses a rotary damper with an adjustable overload protection threshold, comprising: a left connecting member, a ball screw, a screw nut, a friction ring, an inner cylinder, a magnetic ring, an outer cylinder, a first bearing, a second bearing, a third bearing, a fourth bearing, a bearing cover, a first pressure cap, a second pressure cap, a right connecting member, a spring, and a guide sleeve. The left connecting member is fixedly connected to the left end of the ball screw. The screw nut is rotatably mounted on the ball screw. The friction ring is fixedly connected to the screw nut. The first bearing is mounted on the left side of the screw nut, and the second bearing is mounted on the outside of the friction ring. The inner cylinder is located on the right side of the friction ring, with its left end face in close contact with the right end face of the friction ring. The inner wall of the inner cylinder is slidably connected to the guide sleeve. The magnetic ring is fixed to the outer wall of the inner cylinder. The spring is coaxially fixed between the inner cylinder and the right connecting member. This utility model enables overload protection and rapid adjustment of the protection threshold during damper use.

Description

Technical Field

[0001] This utility model relates to the field of structural vibration control technology, and in particular to a rotary damper with an adjustable overload protection threshold. Background Technology

[0002] Rotary dampers, as a new type of damper, are widely used due to their unique displacement amplification effect and high damping characteristics. Traditional rotary dampers mainly use ball screws as the main transmission component. Due to the amplification effect of the ball screw, the rotating parts connected to the ball screw will exhibit an equivalent inertial mass tens or even hundreds of times their own mass. Since there is a large instantaneous acceleration at the moment of startup or turning of the rotary damper, according to the law of acceleration, the rotary damper may be subjected to a force exceeding the design specifications at the moment of startup or turning, which may lead to damage and failure of the damper. Utility Model Content

[0003] To address the above problems, this utility model provides a rotary damper with an adjustable overload protection threshold, thereby solving the problem of damper overload caused by excessive instantaneous acceleration during startup or steering in the prior art.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A rotary damper with an adjustable overload protection threshold includes: a left connecting piece, a ball screw, a screw nut, a friction ring, an inner cylinder, a magnetic ring, an outer cylinder, a first bearing, a second bearing, a third bearing, a fourth bearing, a bearing cover, a first pressure cap, a second pressure cap, a right connecting piece, a spring, and a guide sleeve. The left connecting piece is fixedly connected to the left end of the ball screw. The screw nut is rotatably mounted on the ball screw. The guide sleeve is fixedly connected to the right end of the ball screw. The friction ring is coaxially fixedly connected to the screw nut. The first bearing is coaxially mounted on the left side of the screw nut. The second bearing is coaxially mounted on the outside of the friction ring. The inner cylinder is coaxially disposed on the right side of the friction ring. The left end face of the inner cylinder is in close contact with the right end face of the friction ring. A third bearing is installed on the left outer wall of the inner cylinder, and a fourth bearing is installed in the right mounting groove. The inner wall of the inner cylinder is slidably connected to the guide sleeve. The magnet ring is fixedly installed on the outer wall of the inner cylinder. The outer cylinder is coaxially connected to the outer rings of the first, second, third, and fourth bearings, with a gap between the outer cylinder and the magnet ring. The first pressure cap is fixedly connected to the left inner wall of the outer cylinder and presses against the outer ring of the first bearing. The second pressure cap is fixedly connected to the right inner wall of the outer cylinder and presses against the outer ring of the fourth bearing. The bearing cover is located between the second and third bearings. The right connecting piece is adjustablely fixedly installed at the right end of the outer cylinder. The spring is coaxially fixed between the inner cylinder and the right connecting piece.

[0005] Preferably, the first bearing is an angular contact bearing, used to balance axial tensile force;

[0006] Preferably, the second bearing is a thrust bearing used to balance axial pressure;

[0007] Preferably, the inner cylinder is a semi-enclosed cylinder, and a vent hole is provided at the bottom of the cylinder to balance the air pressure inside the cylinder and prevent changes in the positive pressure between the inner cylinder and the friction ring due to pressure difference.

[0008] Preferably, the friction ring drives the inner cylinder to rotate through the static friction force of the contact surface with the inner cylinder. When the resistance of the inner cylinder is greater than the friction force, the friction ring and the inner cylinder will rotate relative to each other and slide against each other, which plays the role of overload protection.

[0009] Preferably, the right connector can adjust the connection depth with the outer cylinder and the spring compression, thereby adjusting the positive pressure between the inner cylinder and the friction ring and adjusting the overload protection threshold.

[0010] The beneficial effects of this utility model are: First, this utility model indirectly drives the inner cylinder to rotate by setting a friction ring between the lead screw nut and the inner cylinder and using the friction force between the inner cylinder and the friction ring, instead of the traditional rotary damper structure in which the inner cylinder and the lead screw nut are directly fixedly connected. This avoids the overload caused by the large rotational inertia and instantaneous acceleration of the inner cylinder when the damper starts or turns, thus ensuring the safety of the damper. Secondly, this utility model can automatically adjust the overload protection threshold according to the usage requirements to meet the performance requirements under different design requirements. When the friction ring is worn out due to long-term use, causing the overload protection value to decay, the overload protection performance can be quickly restored by simply adjusting the right connecting part. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a cross-sectional view of the present invention;

[0013] In the diagram, 1-left connector, 2-ball screw, 3-screw nut, 4-friction ring, 5-inner cylinder, 6-magnetic ring, 7-outer cylinder, 8-first bearing, 9-second bearing, 10-third bearing, 11-fourth bearing, 12-bearing cover, 13-first pressure cap, 14-second pressure cap, 15-right connector, 16-spring, 17-guide sleeve. Detailed Implementation

[0014] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0015] Example 1: A rotary damper with adjustable overload protection threshold, such as Figure 1-2As shown, the assembly includes: a left connecting piece, a ball screw, a screw nut, a friction ring, an inner cylinder, a magnetic ring, an outer cylinder, a first bearing, a second bearing, a third bearing, a fourth bearing, a bearing cap, a first pressure cap, a second pressure cap, a right connecting piece, a spring, and a guide sleeve. The left end of the ball screw is fixedly connected to the left connecting piece, and the right end is fixedly connected to the guide sleeve. The screw nut is rotatably disposed in the middle of the ball screw. The friction ring is coaxially fixedly connected to the right side of the screw nut. The first bearing is coaxially assembled to the left side of the screw nut, and the second bearing is coaxially assembled to the outside of the friction ring. The inner cylinder is coaxially disposed to the right side of the friction ring, and the left end face of the inner cylinder is in close contact with the right end face of the friction ring. The left outer wall of the inner cylinder is fitted with a first bearing cap, a spring, and a guide sleeve. The inner cylinder has three bearings, with a fourth bearing installed in the mounting slot on the right side. The inner wall of the inner cylinder is slidably connected to the guide sleeve. The magnetic ring is fixedly installed on the outer wall of the inner cylinder. The outer cylinder has mounting slots for the first, second, third, and fourth bearings. The outer cylinder is coaxially connected to the outer rings of the first, second, third, and fourth bearings. The first pressure cap is threadedly fixed to the inner wall on the left side of the outer cylinder and presses against the outer ring of the first bearing. The second pressure cap is threadedly fixed to the inner wall on the right side of the outer cylinder and presses against the outer ring of the fourth bearing. The bearing cap is located between the second and third bearings. The right connecting piece is adjustablely fixed at the right end of the outer cylinder. The spring is coaxially fixed between the inner cylinder and the right connecting piece.

[0016] Working principle: When the damper is subjected to external vibration input, the ball screw will drive the screw nut to rotate. The friction ring, which is fixedly connected to the screw nut, will also rotate synchronously. Due to the restoring force after the spring compression, the contact surface between the friction ring and the inner cylinder will have a certain friction. When the resultant force of the inertial force of the inner cylinder rotation and the damping force is not greater than the friction, the damper can work normally to dissipate energy. However, when the resultant force of the inertial force of the inner cylinder rotation and the damping force exceeds the friction, relative rotational motion will occur between the friction ring and the inner cylinder. The damper will dissipate energy at a fixed force value through the sliding friction between the friction ring and the inner cylinder, ensuring that the damper does not fail and achieving the overload protection function. Furthermore, by adjusting the right connecting part to change the spring compression, the overload protection threshold can be adjusted.

[0017] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A rotary damper with an adjustable overload protection threshold, characterized by: include: The system comprises a left connector, a ball screw, a screw nut, a friction ring, an inner cylinder, a magnetic ring, an outer cylinder, a first bearing, a second bearing, a third bearing, a fourth bearing, a bearing cap, a first pressure cap, a second pressure cap, a right connector, a spring, and a guide sleeve. The left connector is fixedly connected to the left end of the ball screw. The screw nut is rotatably mounted on the ball screw. The guide sleeve is fixedly connected to the right end of the ball screw. The friction ring is coaxially fixedly connected to the screw nut. The first bearing is coaxially mounted on the left side of the screw nut, and the second bearing is coaxially mounted on the outside of the friction ring. The inner cylinder is coaxially positioned on the right side of the friction ring, and the left end face of the inner cylinder is in close, movable contact with the right end face of the friction ring. The inner cylinder has a third bearing mounted on its left outer wall and a fourth bearing mounted on its right mounting groove. The inner wall of the inner cylinder is slidably connected to the guide sleeve. The magnet ring is fixedly mounted on the outer wall of the inner cylinder. The outer cylinder is coaxially connected to the outer rings of the first, second, third, and fourth bearings, with a gap between the outer cylinder and the magnet ring. The first pressure cap is fixedly connected to the left inner wall of the outer cylinder and presses against the outer ring of the first bearing. The second pressure cap is fixedly connected to the right inner wall of the outer cylinder and presses against the outer ring of the fourth bearing. The bearing cover is located between the second and third bearings. The right connecting piece is adjustablely fixedly mounted on the right end of the outer cylinder. The spring is coaxially fixed between the inner cylinder and the right connecting piece.

2. A rotary damper with an adjustable overload protection threshold according to claim 1, characterized in that: The first bearing is an angular contact bearing.

3. A rotary damper with an adjustable overload protection threshold according to claim 1, characterized in that: The second bearing is a thrust bearing.

4. A rotary damper with an adjustable overload protection threshold according to claim 1, characterized in that: The inner cylinder is a semi-enclosed cylinder, and a vent is provided at the bottom of the cylinder.

5. A rotary damper with an adjustable overload protection threshold according to claim 1, characterized in that: The friction ring drives the inner cylinder to rotate through the static friction force between itself and the inner cylinder's contact surface.

6. A rotary damper with an adjustable overload protection threshold according to claim 1, characterized in that: The right connector can adjust the spring compression by adjusting the connection depth with the outer cylinder.

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